using System.IO;
using System.Net.Http;
using System.Reflection;
using System.Text;
using System.Text.Unicode;
using System.Windows;
using System.Windows.Threading;
using Azaion.Annotator;
using Azaion.Common;
using Azaion.Common.Database;
using Azaion.Common.DTO;
using Azaion.Common.DTO.Config;
using Azaion.Common.Events;
using Azaion.Common.Extensions;
using Azaion.Common.Services;
using Azaion.CommonSecurity;
using Azaion.CommonSecurity.DTO;
using Azaion.CommonSecurity.DTO.Commands;
using Azaion.CommonSecurity.Services;
using Azaion.Dataset;
using LazyCache;
using LibVLCSharp.Shared;
using MediatR;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using Serilog;
using KeyEventArgs = System.Windows.Input.KeyEventArgs;

namespace Azaion.Suite;

public partial class App
{
    private IHost _host = null!;
    private ILogger<App> _logger = null!;
    private IMediator _mediator = null!;
    private FormState _formState = null!;

    private IInferenceClient _inferenceClient = null!;
    private IResourceLoader _resourceLoader = null!;
    private Stream _securedConfig = null!;
    private Stream _systemConfig = null!;
    private static readonly Guid KeyPressTaskId = Guid.NewGuid();

    private readonly ICache _cache = new MemoryCache();
    private readonly IHardwareService _hardwareService = new HardwareService();
    private IAzaionApi _azaionApi = null!;

    private void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
    {
        _logger.LogError(e.Exception, e.Exception.Message);
        e.Handled = true;
    }

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        StartLogin();
    }

    private readonly List<string> _encryptedResources =
    [
        "Azaion.Annotator",
        "Azaion.Dataset"
    ];

    private static SecureAppConfig ReadSecureAppConfig()
    {
        try
        {
            if (!File.Exists(SecurityConstants.CONFIG_PATH))
                throw new FileNotFoundException(SecurityConstants.CONFIG_PATH);
            var configStr = File.ReadAllText(SecurityConstants.CONFIG_PATH);
            var config = JsonConvert.DeserializeObject<SecureAppConfig>(configStr);

            return config ?? SecurityConstants.DefaultSecureAppConfig;
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
            return SecurityConstants.DefaultSecureAppConfig;
        }
    }

    private void StartLogin()
    {
        new ConfigUpdater().CheckConfig();
        var secureAppConfig = ReadSecureAppConfig();
        _inferenceClient = new InferenceClient(new OptionsWrapper<InferenceClientConfig>(secureAppConfig.InferenceClientConfig));
        _resourceLoader = new ResourceLoader(_inferenceClient);
        var login = new Login();

        login.CredentialsEntered += async (_, credentials) =>
        {
            credentials.Folder = secureAppConfig.DirectoriesConfig.ApiResourcesDirectory;

            _inferenceClient.Send(RemoteCommand.Create(CommandType.Login, credentials));
            _azaionApi = new AzaionApi(new HttpClient { BaseAddress = new Uri(SecurityConstants.API_URL) }, _cache, credentials, _hardwareService);

            try
            {
                _securedConfig = _resourceLoader.LoadFile("config.secured.json");
                _systemConfig = _resourceLoader.LoadFile("config.system.json");
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
                _securedConfig = new MemoryStream("{}"u8.ToArray());
                var systemConfig = new
                {
                    AnnotationConfig = Constants.DefaultAnnotationConfig,
                    AIRecognitionConfig = Constants.DefaultAIRecognitionConfig,
                    ThumbnailConfig = Constants.DefaultThumbnailConfig,
                };
                _systemConfig = new MemoryStream(Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(systemConfig)));
            }

            AppDomain.CurrentDomain.AssemblyResolve += (_, a) =>
            {
                var assemblyName = a.Name.Split(',').First();
                if (_encryptedResources.Contains(assemblyName))
                {
                    try
                    {
                        var stream = _resourceLoader.LoadFile($"{assemblyName}.dll");
                        return Assembly.Load(stream.ToArray());
                    }
                    catch (Exception e)
                    {
                        Console.WriteLine(e);
                        var currentLocation = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)!;
                        var dllPath = Path.Combine(currentLocation, SecurityConstants.DUMMY_DIR, $"{assemblyName}.dll");
                        return Assembly.LoadFile(dllPath);
                    }
                }

                var loadedAssembly = AppDomain.CurrentDomain.GetAssemblies()
                    .FirstOrDefault(a => a.GetName().Name == assemblyName);

                return loadedAssembly;
            };

            StartMain();
            _host.Start();
            EventManager.RegisterClassHandler(typeof(UIElement), UIElement.KeyDownEvent, new RoutedEventHandler(GlobalClick));
            _host.Services.GetRequiredService<MainSuite>().Show();
        };

        login.ShowDialog();
    }

    private void StartMain()
    {
        Log.Logger = new LoggerConfiguration()
            .Enrich.FromLogContext()
            .MinimumLevel.Information()
            .WriteTo.Console()
            .WriteTo.File(
                path: "Logs/log.txt",
                rollingInterval: RollingInterval.Day)
            .CreateLogger();

        _host = Host.CreateDefaultBuilder()
            .ConfigureAppConfiguration((context, config) => config
                .AddCommandLine(Environment.GetCommandLineArgs())
                .AddJsonFile(SecurityConstants.CONFIG_PATH, optional: true, reloadOnChange: true)
                .AddJsonStream(_securedConfig)
                .AddJsonStream(_systemConfig))
            .UseSerilog()
            .ConfigureServices((context, services) =>
            {
                services.AddSingleton<MainSuite>();
                services.AddSingleton<IHardwareService, HardwareService>();

                services.Configure<AppConfig>(context.Configuration);
                services.ConfigureSection<QueueConfig>(context.Configuration);
                services.ConfigureSection<DirectoriesConfig>(context.Configuration);
                services.ConfigureSection<AnnotationConfig>(context.Configuration);
                services.ConfigureSection<AIRecognitionConfig>(context.Configuration);
                services.ConfigureSection<ThumbnailConfig>(context.Configuration);
                services.ConfigureSection<UIConfig>(context.Configuration);

                #region External Services

                services.ConfigureSection<InferenceClientConfig>(context.Configuration);
                services.ConfigureSection<GpsDeniedClientConfig>(context.Configuration);
                services.AddSingleton<IInferenceClient>(_inferenceClient);
                services.AddSingleton<IGpsMatcherClient, GpsMatcherClient>();
                services.AddSingleton<IInferenceService, InferenceService>();
                services.AddSingleton<IGpsMatcherService, GpsMatcherService>();
                services.AddSingleton<ISatelliteDownloader, SatelliteDownloader>();
                services.AddHttpClient();
                services.AddSingleton(_azaionApi);
                #endregion

                services.AddSingleton<IConfigUpdater, ConfigUpdater>();
                services.AddSingleton<Annotator.Annotator>();
                services.AddSingleton<DatasetExplorer>();
                services.AddSingleton<HelpWindow>();
                services.AddMediatR(c => c.RegisterServicesFromAssemblies(
                    typeof(Annotator.Annotator).Assembly,
                    typeof(DatasetExplorer).Assembly,
                    typeof(AnnotationService).Assembly));
                services.AddSingleton<LibVLC>(_ => new LibVLC());
                services.AddSingleton<FormState>();
                services.AddSingleton<MediaPlayer>(sp =>
                {
                    var libVLC = sp.GetRequiredService<LibVLC>();
                    return new MediaPlayer(libVLC);
                });
                services.AddSingleton<AnnotatorEventHandler>();
                services.AddSingleton<IDbFactory, DbFactory>();

                services.AddSingleton<FailsafeAnnotationsProducer>();

                services.AddSingleton<AnnotationService>();

                services.AddSingleton<DatasetExplorer>();
                services.AddSingleton<IGalleryService, GalleryService>();

                services.AddSingleton<IAzaionModule, AnnotatorModule>();
                services.AddSingleton<IAzaionModule, DatasetExplorerModule>();
            })
            .Build();

        Annotation.InitializeDirs(_host.Services.GetRequiredService<IOptions<DirectoriesConfig>>().Value);

        _mediator = _host.Services.GetRequiredService<IMediator>();
        _logger = _host.Services.GetRequiredService<ILogger<App>>();
        _formState = _host.Services.GetRequiredService<FormState>();
        DispatcherUnhandledException += OnDispatcherUnhandledException;
    }

    private void GlobalClick(object sender, RoutedEventArgs e)
    {
        var args = (KeyEventArgs)e;
        var keyEvent = new KeyEvent(sender, args, _formState.ActiveWindow);
        ThrottleExt.Throttle(() => _mediator.Publish(keyEvent), KeyPressTaskId, TimeSpan.FromMilliseconds(50));
    }

    protected override async void OnExit(ExitEventArgs e)
    {
        base.OnExit(e);
        await _host.StopAsync();
    }
}